Clutching and speed changing mechanism



June 14, 1938. '.J. zoTAl.,lv 2,120,733

CLUTCHINQ AND SPEED CHANGING MECHANISM Filed sept.- 4,1936

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Patented June 14, 1938 CLUTCHING AND SPEED CHANGING MECH- ANISM Jean Octal, Paris, France Application 6 Claims.

Preferably, the gear ratios' and the construetion of the planetary sets are such that the secondary shaft, vaccording to the connections made l under electric control, may be driven by the driving shaft either with speed reduction, or on direct drive, or at increased speed.

According .to another characteristic, the dimensions of the second set are reduced with ref- 2n erence to those of the rst set, in such way that the parts connected with the secondary shaft, which is adapted for a high speed of rotation, will have reduced masses.

Preferably, there is mounted between the: afore- 25El said secondary shaft and the shaft to be driven, a

planetary mechanism, or the like, provided with teeth, claws or other projections affordingeither a direct connection or a connection with speedreduction. in the same direction or in contrary directions.

In .this case, there is preferably provided a means for braking or for stopping, under electromechanical control which permits of eliminating any driving torque produced by the driving shaft,

of the stationary casing 4. The driven shaft 5, which projects from the said casingthrough a second ball bearing 8, extends to the point 5B within the shaft l, in whichv it is centered on the axis X--X. Y

To the driving shaft I is keyed a sun-wheel 9 with external teeth, pertaining to a rst plane-` tary gear set whose orbit-wheel I0 with internal teeth is loose about the shaft I (it being mountin order to facilitate the engagement of the teeth.

ball bearing 2 which is located in the cover 3 ed forinstance on an extension of thev hub of the September 4, 1936, Serial No. 99,478 In France May 26,` 1936 (ci. 'i4-2mA sun-wheel 9). The orbit-wheel IIJ may be secured to the shaft Ior to the casing 4. For this purpose, 'it is extended at the' periphery by an armature II to which is secured an auxiliary armature I 2. Opposite the armature Il is located 5 an electromagnet I3 which is secured tothe casing ll. Opposite the auxiliary armature I2 is mounted another electromagnet I4 which is keyed to the driving or primary shaft I. It will thus be observed that'according as the electromagnet i3 10 or I4 is energized, the orbit-wheel I0 will be held fast with reference to the casing #t or will be connected, as to rotation, with the shaft I. When the electromagnets I3 and III are not energized, the orbit-Wheel III is loose.

The sun-wheel 9 and orbit-wheel It are in gear engagement with planetary pinions I5, mounted on planetary pinion carrier I6 which is loose on the shaft I. To the hub of the said carrier I6 is keyed the hub of the planetary pinion 2o carrier'I'I of` a second planetary gear set. The planetary pinions I8 of this second set are in gear with a sun-Wheel I9 having external teeth. and also with an orbit-wheel 42li having internal teeth. 25

The sunwheel I9 with external teeth is loose about the axis X-X, and is for instance loose on the hub ofl the planetary pinion carrier I1.

It is extended at the periphery by a ring 2l which forms an armature located between two electro- 30 magnets 22 and 23. The electromagnet 22 is securedfto the casing 4, and it thus permits of holding the sun-wheel I9 in the ilxed position. The other electromagnet 23 is mounted on the orbit-wheel 20 with internal teeth, and-'itthus 35 permits of connecting together, as to rotation,A the slm-wheel I9-an`d orbit-wheel 20 of the sec- I ond set.

Preferably, the radial dimensions of the secand set are less than those of the ilrst set, and o hence the masses, and chieiiy of the electromagnet 23 and the armature 2l adapted for a rapid rotation, will have relatively a reduced value. This is obtained principally by the method used for connecting the planetary pinion car- 45 riers I6 and Ilu together at their centers and by the respective values of the gear ratios in each set. This arrangement permits, in fact, of locating the web or the arms of the armature-2i, secured to the sun-'wheel I9, between these two 50 planetary pinion carriers.

-The orbit-wheel 20 with internal teeth might besecured, as to rotation, to the driven shaft I.

However, inthe embodiment herein represented, between the orbit-wheel 2n and the shaft is.

said carriers and a first internally toothed wheel i connected with the other of said shafts and meshing with the pinion of the other carrier. a second internally toothed wheel meshing with the pinion on said one of said carriers and 'a second externally toothed sun-wheelmounted rotatably and loose on said sleeve and meshing with the pinion on said other of said carriers, means adapted to selectively brakel said second' internally. toothed wheel and connect the lsame with said one of said shafts, and means adapted to selectively b'rak'e said second externally toothed sun-wheel and connect the same with said other of said shafts.

3. In a speed changing mechanism, a driving shaft, a driven shaft, two pinion carriers mounted rotatably and loose on one of said shafts and connected togetheriat their central part, on 'each of said pinion carriers at least one pinion rotatably mounted on said carrier, a rst externally toothed sun-.wheel connected-with said driving shaft and meshing with the pinion4 of one of said carriers and a first internally toothed wheel connected with said driven shaft and'meshing with the pinion of the other carrier, a second internally toothed wheel meshing lwith the pinion on Said one of said carriers andla secondl exter nally toothed sun-wheel meshing with the pinion on said other of saidcarriers, means adapted to selectively brake said second internally toothed wheel'and connect( the same with said `driving shaft, and means adapted to selectively brake said second externally toothed sun-wheel and connect the same with said driven(v shaft. A

4. In a speed changing mechanism according to claim 3, the further feature consisting in that the size. of the planetary set comprising the second externally toothed sun wheel, the first internally toothed wheel and the pinion meshing with the same is smaller than that of the planetary setcomprising the first externally toothed sunwheel, the second internally toothed wheel and the pinion meshing with said two latter wheels.

5. In a speed changing mechanism according to claim l, the further feature consisting in that the selective means for said second internally toothed wheel comprises two electromagnets, one of which is stationary and the other is connected with the shaft corresponding to said selective means, and two 'armatures rotatable vwith said first 'externally toothed sun-wheel, slidingly mounted on each other in an axial direction and adapted to be brought respectively into contact with said two electromagnets, and spring means adapted to urge said armatures towards each other and out of -contact with said electromagnets.

6, I n a speed changing mechanism according to claim 3, the further feature consisting in that the speed reducing gear ratio of the planetary set comprising the iirst externally toothed sun- Wheel, the second internally toothed wheel and the pinion meshing with the same, when said second internally toothed wheel is held stationary, is greater than` the speed increasing gear ratio of the planetary set comprising the second externally toothed sun-wheel, thefiirst internally toothed wheel and the pinion meshing with the same, when said second externally toothed wheel is held stationary.

JEAN COTAL. 

